HEIDENHAIN TNC 640 (34059x-02) ISO programming - Manual (Page 153)

Entering tool-related data 5.1
5
TNC 640 | User's Manual for DIN/ISO Programming | 5/2013
153
Spindle speed S
The spindle speed S is entered in revolutions per minute (rpm) in a
T block. Instead, you can also define the cutting speed Vc in m/min.
Programmed change
In the part program, you can change the spindle speed in a T block
by entering the spindle speed only:
To program the spindle speed, press the S key on
the alphabetic keyboard.
Enter the new spindle speed
Changing during program run
You can adjust the spindle speed during program run with the
spindle speed override knob S.